Improvement in attaching the point to the shank of subsoil-plows



J.' W. MURPBE. Subsol P10W. No. 106,193.` Patented Aug. 9, 1870'.

m Y @Mlm mlllnmllh PATENT OFFICE.

JAMEs w. MUEEEE, `o/E HAVANA, ALABAMA.

IMPROVEMENT IN ATTACHINGTHE POINT T0 THE SHANK 0F SUBSOIL-PLOWS.

Specification forming part of Letters Patent No. 106il93, dated August 9, 1870.

To all whom it may concer/a.-

Be it known that I, JAMEs W. MUEEEE, of Havanalale county,Alabama, have invented a new and useful Im} )rovement in the Mode ot' Attaching the Point to the Shank of my Improved Subsoil-Plom which plow was patented June 22, 1869,No. 91,657, and reissued August 24, 1869; and I do hereby declare that the following is a full, clear and exact description thereof, which will enable others skilled in the art to make and use the same, referencebeing had to the accompanying dra-wings, forminga part of this specification.

Figure l is a side elevation of thesubsoil plow-point,beel,and part ofthe shank orhelve. Fig. 2 is a rear view of the heel and section through the shank Y Z. Fig. 3 isa side and end perspective of the reversed-wedge ele: vated heel with female mortise for the Vinsertion of the male tenon ot the point. Fig. t is aside and end perspective ot' the detached point with male tenen and screw for insertion into the heel of the shank. Fig. 5.isasection (transverse) of point and heel at their juncnon. heel and point of the plow, showing the inortise, tenon, and screw attachment. Fig. 7 is a horizontal projection of bottom ot' the point and tenon. 1

-My invention consists in the arrangement 'of a male tenon (with screw and tap at its end) to my subsoilplow point, (patented June 22 and August 24, 1869,) inserted into a female mortise in the heel ofthe shank or belve, and in holding the two parts (heel and point) together by a bolt and screw at the rear, and a double shoulder at the front. The screw at s passes through a hole, ai, in the rear and solid Vpart of the heel 7L, and is drawn up home by the tap t, binding the point and shank closely Fig. 6 is a horizontal projection of-Mthje strength of metal in the tenon. The tenon'is shouldered and swelled to the point at c by curved surfaces, so as to cause the metal to form, in casting, the strongest union at that v point. The top of the tenon and mortise is curved, so as to allow more metal inthe shank atd than there would be it' the tenon wer made square on top.

The operation is as follows: My patent subsoil-plow heel and point being put together by the join tabove described, (mortise and tenon with screw and tap), the heel is easily given that reversed, wedge shape and elevation described in my aforementioned Letters Patent; and by the use of this joint both heel and point can more easily be given the shapes and sets required in my specifications of said Letters Patent for improvement in subsoil` plows. As the plow is drawn through?` the ground the downward pressure comes n'the shoulders b b of the heel, and there being two ot'these, and as large as practicable, this pressure is most effectually resisted. Any upward pressure is resisted by the upper shoulder, a a, of the shank. Any side pressure to the right or leIt, is resisted by the doublejawsjj ofithe heel, which in point of strength are united as it' one by the tap t and bolt s.' The bottom of the mortise being open,the tenon can be made sufficiently large for strength, and the sole of the heel can be well elevated above the base of the point without making the total depth or rise of the point 'w so great as to impede vthe draft, as would be the case if space had to be given for filling up the lower side of the mortise at o.

Having thus described my invention, what I claim as new, and desire to secure by Letters In a subsoil-plow, the mortised heel h to the end of the colter-shank, in combination with the tenon d, attached to the point of the plow and secured in place by the screw s and tap t, substantially as specified. JAS. W. MURFEE.

Witnesses z B. TRAVIS, WM. OHRIs'rIAN. 

